Journal
PHYSICAL REVIEW D
Volume 90, Issue 12, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.90.124061
Keywords
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Funding
- Ministerio de Economia y Competitividad (Spain) [FIS2010-15640, FIS2013-44881]
- JSPS [22224003, 23540296, 25800136]
- University of the Basque Country, Project Consolider Centro Nacional de Fisica de Particulas, Astroparticulas y Nuclear [CSD2007-00042]
- NRF - University of Cape Town (South Africa)
- ICREA Funding Source: Custom
- Grants-in-Aid for Scientific Research [25800136, 22224003, 23540296] Funding Source: KAKEN
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We investigate the descriptions for the observables of inflationary models, in particular, the spectral index of curvature perturbations, the tensor-to-scalar ratio, and the running of the spectral index, in the framework of perfect fluid models and F(R) gravity theories through the reconstruction methods. Furthermore, the perfect fluid and F(R) gravity descriptions of inflation are compared with the recent cosmological observations such as the Planck satellite and BICEP2 experiment. It is demonstrated with explicit examples that perfect fluid may lead to the inflationary universe consistent with the Planck data. It is also shown that several F(R) gravity models, especially, a power-law model gives the best fit values compatible with the spectral index and tensor-to-scalar ratio within the allowed ranges suggested by the Planck and BICEP2 results.
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